Fix for oplog file-delete logging issue with out-of-scope variables

[timvaillancourt]

Fix for #37, which repeated the same host/port in log lines due to using out-of-scope variables. Added host/port to a dict in the oplog_files array so we can print it.

BEFORE:

[2016-07-22 16:09:58,863] [DEBUG] [MainProcess] [Resolver:run:89] Deleting tailed oplog file for localhost:27017
[2016-07-22 16:09:58,863] [DEBUG] [MainProcess] [Resolver:run:89] Deleting tailed oplog file for localhost:27017
[2016-07-22 16:09:58,863] [DEBUG] [MainProcess] [Resolver:run:89] Deleting tailed oplog file for localhost:27017
[2016-07-22 16:09:58,863] [DEBUG] [MainProcess] [Resolver:run:89] Deleting tailed oplog file for localhost:27017

AFTER:

[2016-07-22 16:08:29,208] [DEBUG] [MainProcess] [Resolver:run:93] Deleting tailed oplog file for centos7:27029
[2016-07-22 16:08:29,208] [DEBUG] [MainProcess] [Resolver:run:93] Deleting tailed oplog file for localhost:29017
[2016-07-22 16:08:29,208] [DEBUG] [MainProcess] [Resolver:run:93] Deleting tailed oplog file for localhost:28027
[2016-07-22 16:08:29,209] [DEBUG] [MainProcess] [Resolver:run:93] Deleting tailed oplog file for localhost:27017